Swelling after Robenacoxib (Onsior) in cats

The FDA has received 228 reports of swelling in cats after Robenacoxib. That is 7.0% of all reports for this medicine, compared with 1.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

228Reports

50%Marked serious

24%Recovered

31%Died or euthanised

1 daysTypical onset

How soon it started

Same day

67 36%

1–2 days

43 23%

3–7 days

42 23%

1–4 weeks

22 12%

Over a month

11 5.9%

How the animals did

Recovered

55 24%

Still unwell when reported

67 29%

Died

45 20%

Euthanised

25 11%

Not known

36 16%

Problems reported at the same time

Death

69 30%

Loss of appetite

59 26%

Injection site reaction

48 21%

45 20%

29 13%

24 11%

21 9.2%

19 8.3%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Robenacoxib relieves pain and inflammation (short courses).

Products with this ingredient include Onsior. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.

NSAIDs can affect the stomach, liver and kidneys. Vets usually recommend blood tests before and during long-term use.

Questions owners ask

Can Robenacoxib cause swelling in cats?: 228 reports link the two, but a report alone does not prove the medicine was the cause: other illnesses, other medicines or coincidence can be involved. Your vet can judge it for your animal.
How soon after a dose was it reported?: In half of the reports with dates, it started within 1 day of the first dose.
What should I do?: Don't give another dose until you've spoken to your vet, and keep the packaging so you can tell them the product and dose. Your vet can also report it to the FDA (or you can, through the manufacturer or FDA form 1932a).

Swelling with similar medicines

Swelling after Meloxicam (Metacam) 140 reports · 3.8% of its reports

All reported side effects of Robenacoxib in cats · Medicines most reported with swelling